"I have found something very interesting and shows that there is life on Mars; not a big creature by any means, but it does appear to have legs and look like an insect. I have called it a 'cricket'.
"At first I thought that the upright pipe might be obscuring it, but if you relate [the 'cricket's'] position to the rock above it (shaped a bit like the Star Trek emblem), it is definitely missing, therefore it has moved. The address for the raw photos is http://marsrover.nasa.gov/gallery/all/spirit_n1861.html
"Can we name the cricket Robert after me, please?"
Rob, if we could prove it was a cricket and I was in charge of naming such things, I would certainly name it after you. So what do you think, readers? Has Rob spotted a critter on Mars? Other possibilities include something light (and not alive) that was blown away by the wind before the second picture was taken. Or the dark spot could be a photographic flaw or speck of dust on the camera lens. Then again, perhaps it is Marscricketitus Robertus.